Question

Assertion- The ionic radii follow the order I- > I > I+
Reason- These are isoelecronic species.​

Answer 1

Answer:

assertion is true but reason is false

Explanation:

isoelectronic species are 2 different atoms, molecules or ions having same number of electrons, but here I-,I,I+ have different number of electrons,I has 53 while I- has 54 and I+ has 52

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Answer 2

The ionic radii follow the order $\[{I^ - } > I > {I^ + }\]$ . They are not isoelectronic species. Therefore, the assertion is correct but the reason is incorrect.

Explanation:

• The ionic radius of an anion is more than that of a neutral atom while the ionic radius of a cation is less than that of a neutral atom.
• The cation is formed by the removal of an electron which decreases the size of the atom. Therefore, the ionic radius of a cation is less than that of a neutral atom.
• On the other hand, an anion is formed by the gain of an electron which increases the size of the atom. Therefore, the ionic radius of an anion is more than that of a neutral atom.
• Isoelectronic species are those in which the number of electrons is same.
• As the electrons are lost or gained in a cation and an anion respectively, they cannot be isoelectronic species.
• $I$ has 53 electrons, $\[{I^ - }\]$ has 54 electrons while $\[{I^ + }\]$ has 52 electrons.